I will try keep this to the point, in the terms and conditions of each promotion that a bookie has they attach various conditions. The main two are minimum odds (Covered in the matched betting guide here) and the other is turnover, covered here.
Essentially it is an amount of money that you must gamble with a betting site before they let you withdraw any winnings from a bonus bet. Some offer 1x turnover which is the best so if you have a $200 bet you want to extract you just have to do one “Qualifier bet” to complete this turnover. So just place a $200 bet and then lay it with the exchange using the guide.
You will always have to bet through the amount you deposited 1x and the bonus 1x. This is normal and is completed by simply doing a standard matched bet. (Qualifier & free bet in the calculator from the tutorial)
Some bookmakers have higher turnover requirements such as 2x, 3x and higher, these should only be completed after you complete the first and easiest matched betting bonus bets, These higher turnover requirements work like this.
I deposit $100 to get a bonus bet. I must turnover the deposit 3x. This means I must gamble that amount of money before I can extract the bonus cash.
If your free bonus bet loses with the bookie and wins with the exchange then this is great, the money can then just be taken out of the exchange back into your bank. if it wins with the bookie and loses with the exchange then you must complete the turnover amount before extracting.
You simply do this by repeating step 1 and placing qualifier bets until you reach the amount required or until the exchange wins and the bookie bet loses. This involves making that small qualifying loss each time you have to do this so it can eat into your profit, not by too much though, you will still heavily profit each time.
The main point to take from this is that after the easy offers are complete keep an eye out for high turnover amounts as you will need to make sure you have the money in your exchange to lay your bets to match the back bet with the bookie.
Put any questions in the comments and I will be happy to help.